Feature spec
Goal: Send a clear invoice after finishing a job.
- Add a client, line items, a due date, and payment instructions.
- Preview the total before exporting a PDF.
- Keep an editable draft if export fails.
App Overview
Where's My Water?
Get the GAME OF THE YEAR award-winning puzzler!
$1.99 · In-app purchases
OVERALL US RANK
#65
Paid · all categories
REVENUE (Est)
$162K/mo
$91K - $233K
RATING
★ 4.3
2,750 ratings · Top 30%
Evidence scope: #65 is the current overall US Paid chart position. Category-chart positions shown in discovery are a separate scope. Revenue is a directional model estimate, not verified earnings.
Build your own version
Build Kit
Make this idea yours
A product spec, screen plans, and build steps for your coding agent.
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Combine features and design from your favorite apps.
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What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included18 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
Preview a sample Build Kit No email needed
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Screen plan
Invoice editor: Client at the top, editable line items in the middle, total and preview action at the bottom.
States: Empty draft, validation errors beside each field, exporting, and a retry action that preserves the draft.
Differentiate and validate
Hypothesis: Contractors need faster repeat invoices more than more templates.
First experiment: Test duplicating a previous job with five contractors. Watch where they hesitate before expanding the feature set.
The full kit adds a phased build plan, evidence notes, tool prompts, and implementation guidance. It is a plan for your coding agent, not a finished app.
Usage: Mechanics are fair game; never reuse the original name, branding, assets, or verbatim copy.
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Free quick prompt For a smaller starting point
Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for Where's My Water?: map the core Games workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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Opportunities
AI-GENERATED OPPORTUNITY HYPOTHESES
These are generated suggestions, not verified review quotations. Check current App Store reviews and speak with users before treating a possible gap as a requirement.
Hypothesis 1
Introduce new mechanics and level variations frequently.
Assumption to check: Levels can become repetitive and boring over time.
Validate with people who use this workflow before building.
Hypothesis 2
Offer daily free hints or challenges for rewards.
Assumption to check: Hints can be too expensive for casual players.
Validate with people who use this workflow before building.
Hypothesis 3
Implement a more balanced reward system for earning in-game currency.
Assumption to check: In-app purchases can disrupt the gameplay experience.
Validate with people who use this workflow before building.
Hypothesis 4
Add cosmetic items and unlockable characters to enhance player engagement.
Assumption to check: Limited character customization options.
Validate with people who use this workflow before building.
App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
App Store description
Get the GAME OF THE YEAR award-winning puzzler! Help Swampy by guiding water to his broken shower. Each level is a challenging physics-based puzzle with amazing life-like mechanics. Cut through dirt to guide fresh water, dirty water, toxic water, steam, and ooze through increasingly challenging scenarios! Every drop counts! • Original Stories & Characters – Play through 4 unique stories featuring Swampy, Allie, Cranky and Mystery Duck. That’s over 500 amazing puzzles! • Innovative Mechanic – See water in various forms and use your creativity to solve the puzzles – totally stimulating! • Collectibles, Challenges, and Bonus Levels – Collect special items uniquely designed for each character and complete cool challenges to unlock bonus levels! “Tri-Duck” each level for ultimate bragging rights! • Synchronization – Share your hard earned progress across multiple iOS 5 devices! SWAMPY’S STORY Swampy the Alligator lives in the sewers under the city. He’s a little different from the other alligators – he’s curious, friendly, and loves taking a nice long shower after a hard day at work. But there’s trouble with the pipes and Swampy needs your help getting water to his shower! ALLIE’S STORY Allie is the sewer's most creative alligator. Her quirky spirit and artistic talents made her a star. Now, the gators have crafted a one-of-a-kind steam-powered musical instrument, and can't wait to hear her play it! Help Allie get the steam she needs and enjoy her take on classic Disney tunes. CRANKY’S STORY Cranky, a real gator’s gator, has a big appetite and will eat anything, from tires to old fish bones. But he refuses to eat his greens! Use the dirty purple water to clear the algae on Cranky’s plate so he can gobble up his “food”. MYSTERY DUCK Catch this fancy teleporting Mystery Duck in this special chapter and hint hint - timing is everything! Find all kinds of surprises including the biggest duck ever, MegaDuck and cute little Ducklings! Some stories may require a small additional price but try the FREE levels today! Before you download this app, please consider that this app includes advertising, some of which may be targeted to your interests. You may choose to control targeted advertising within our applications by using your mobile device settings (for example, by re-setting your device’s advertising identifier and/or opting out of interest based ads). • In-app purchases that cost real money • The option to accept push notifications to let you know when we have exciting updates like new content • Location-based services • Advertising for some third parties, including the option to watch ads for rewards • As well as advertising for The Walt Disney Family of Companies Privacy Policy - https://privacy.thewaltdisneycompany.com/ Terms of Use - https://disneytermsofuse.com/ Your California Privacy Rights - https://privacy.thewaltdisneycompany.com/en/current-privacy-policy/your-california-privacy-rights/ Do Not Sell My Info - https://privacy.thewaltdisneycompany.com/en/dnsmi/ Children’s Online Privacy Policy - https://privacy.thewaltdisneycompany.com/en/for-parents/childrens-online-privacy-policy/
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Screenshots
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Build scope
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Define the first version
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Set boundaries
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Check the hard parts
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
SUGGESTED BUILD STACK
React Native
Expo
Zustand
Supabase
react-navigation
react-native-reanimated
BUILD KIT DIFFICULTY
Advanced
From the Build Kit assessment.
A reliable timeline needs an agreed scope and a technical check. Ask your agent to estimate the phases in BUILD_PLAN.md after that review.
